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Full Idea
'Disjunctive Normal Form' (DNF) is rearranging the occurrences of ∧ and ∨ so that no conjunction sign has any disjunction in its scope. This is achieved by applying two of the distribution laws.
Gist of Idea
'Disjunctive Normal Form' is ensuring that no conjunction has a disjunction within its scope
Source
David Bostock (Intermediate Logic [1997], 2.6)
Book Ref
Bostock,David: 'Intermediate Logic' [OUP 1997], p.39